I am one of the few who enjoyed the movie
OK, just saw this on Blu-ray. I'm been watching horrors and thillers for a long time. The way I review movies are: (1) watched it at the theater but that's it, (2) rent it, (3) download/rip it and keep it on your hard drive for a while, or (4) buy it on DVD/Blu-ray. I would put it in my (3) "rip it" category. Here are the rest of my thoughts:
American thrillers/horror movies (and movies that don't necessarily fit into one of these genre) typically are about 1) sick people/schizophrenia, 2) serial killers, or 3) paranormal stuff. I saw the schizophrenia/sick stuff near the beginning of the movie. Unfortunately, the writers typically weren't creative enough to hide this as they simply used the same type of movie making technique as similar character-is-sick type of movies.
Now, if you get the sick person part, then the plot is now established. This becomes a movie where she see things, imaginary person who doesn't exist, and people she thought were intruders who are actually just a rehash of her memories. And she's pretty much terrified, not knowing what to do, seeing a bleeding wall/bed, etc.
[SPOILER ALERT]
In the end, she leaves the house. Doesn't matter what happens to her or the house. You can use your imagination as she kills her father and leaves her actually-a-person-who-should-have-helped-but-really-didn't type of uncle alive.
From a performance review, Ms. Olsen is very good at looking terrified. From a movie technique, I liked the fact it was made to look as if it was done in one cut. Overall, I enjoyed the move--but from a "I rather just download it from the warez sites" perspective and maybe delete it from my hard drive after a few more viewings.
Last thought. For some really good schizophrenic terror, I'd recommend the following movies:
1. High Tension (2003)
2. The Uninvited (2009)